{
  "pools": {
    "main": {
      "servers": [ "127.0.0.1:12345" ]
    },
    "shadow": {
      "servers": [ "127.0.0.1:12346" ]
    }
  },
  "route": {
    "type": "PoolRoute",
    "pool": "main",
    "shadows": [
      {
        "target": "PoolRoute|shadow",
        "index_range": [0, 1],
        "key_fraction_range": [0.0, 1.0]
      }
    ]
  }
}
